> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of Bob Dengler
> Sent: Monday, January 30, 2006 12:43 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] New system's in, but a few problems
>
> At 1/29/2006 11:37 PM, you wrote:
> >About 8 years ago, I tried using a Comet GP-9 antenna
> combined to serve
> >two repeaters, one on 2 meters & the other on UHF. I found the GP-9
> >worked FAR better on 2 meters than on 445 MHz.
> >
> >I was running good GE Mastr Pro repeaters, good pass/reject
> duplexers,
> >good ARR GaAsFET pre-amps, and had NO desence.
> >
> >The comet GP-9 simply is not very good for UHF. Of course,
> the water
> >you foung in the antenna is not good either.
>
> My experience has been quite different, as I've found the GP9
> to be overall a very good UHF antenna. I have a 2 meter &
> 440 system running off of one in a very similar layout to
> yours (antenna only a few feet above the equipment); the 440
> outperforms 2 meters as expected. No desense on either band.
> There is a DB-408 at the site that we once tried but the GP9
> outperforms it as well.
>
> Bob NO6B
Mine has been just the opposite of Bob's, and in fact, I'm using the same
antennas! I had a GP9 top-mounted on a tower, my UHF repeater and an APRS
digipeater on it. The GP9 developed crackling noises after about a year of
use. I and the owner of the APRS digi decided to put up separate antennas -
mine a DB408 replacing the GP9 on top of the tower, and his a DB224
side-mounted below it. When we got the GP9 down, we didn't find anything
obvious wrong with it, either internally or externally, and the guy with the
APRS digi took the antenna and is now using it for something else. The
DB408 (ham-cut version) plays much better than the GP9 ever did. As usual,
YMMV.
--- Jeff
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